After a month of promotions, Heo Young Saeng said goodbye on today's MBC Music Core. After promoting as SS501's vocalist for seven long years, Heo Young Saeng had made his debut as a solo artist with his title track, "Let It Go" last month! Produced by Sweetune, the song describes the different ways men and women approach love, and the misunderstandings that result from it. This urban pop song has both a simple but strong beat with a combination of both ballad and dance and an upbeat chorus that brings out the best of his sweet voice. Check out his goodbye stage below!